Here's some happy news for germaphobes: your belly button, or "umbilicus" as scientists call it, is absolutely filthy, with over 2,000 different types of bacteria living in it. As ABC News puts it, this "means you have more kinds of bacteria in your belly button than there are different kinds of ants or birds in North America."

Even more exciting is the fact that everyone's gross navel is unique; not one common type of bacteria was found in the 60 belly buttons sampled and most strands were "rare and occurred in just one individual."

For your average person, this might come as a disgusting surprise, but belly button experts are pretty blasé.